Here is the full list of all 46 Digimon Survive achievements.
Unlocked all achievements.
Encountered all monsters.
Completed Truthful route to the next generation.
Beat Fanglongmon Ruin Mode.
Beat Zhuqiaomon.
Beat Azulongmon.
Beat Ebonwumon.
Kunemon reached Mega level.
Lopmon reached Mega level.
Beat Baihumon.
Took the Truthful route.
Beat MegaSeadramon.
Completed the Wrathful route.
Beat Plutomon.
Completed the Moral route.
Beat the Master.
Saved Miyuki.
Evolved to Omegamon.
Garurumon reached Mega level.
Syakomon reached Mega level.
Dracmon reached Mega level.
Acquired 100 items while exploring.
Completed the Harmonious route.
Entered the final battle.
Beat Boltboutamon.
Renamon reached Mega level.
Floramon reached Mega level.
Falcomon reached Mega level.
Labramon reached Mega level.
Agumon reached Mega level.
Reached a fork in the story.
Beat Piedmon.
Beat Wendigomon
Agumon reached Ultimate level.
Beat Monzaemon.
Beat Garurumon.
Beat Cyclonemon.
Beat Arukenimon.
Evolved a Free Monster.
Beat Fangmon.
Beat Dokugumon.
Agumon reached Champion level.
Acquired your first item while exploring.
Recruited a Free Monster.
Agumon reached Rookie level.
Embarked on your adventure.